分页存储过程 排除重复行
分页存储过程 因为使用ROW_NUMBER() 所以不能使用distinct去掉重复的行。请教如何修改才能去掉重复的行
Create PROCEDURE [dbo].[GetRecordFromPage]
@SelectList VARCHAR(2000), --欲选择字段列表
@TableSource VARCHAR(100), --表名或视图表
@SearchCondition VARCHAR(2000), --查询条件
@OrderExpression VARCHAR(1000), --排序表达式
@PageIndex INT = 1, --页号,从0开始
@PageSize INT = 10 --页尺寸
AS
BEGIN
IF @SelectList IS NULL or LTRIM(RTRIM(@SelectList)) = ''
BEGIN
SET @SelectList = '*'
END
PRINT @SelectList
SET @SearchCondition = ISNULL(@SearchCondition,'')
SET @SearchCondition = LTRIM(RTRIM(@SearchCondition))
IF @SearchCondition <> ''
BEGIN
IF UPPER(SUBSTRING(@SearchCondition,1,5)) <> 'Where'
BEGIN
SET @SearchCondition = 'Where ' + @SearchCondition
END
END
PRINT @SearchCondition
SET @OrderExpression = ISNULL(@OrderExpression,'')
SET @OrderExpression = LTRIM(RTRIM(@OrderExpression))
IF @OrderExpression <> ''
BEGIN
IF UPPER(SUBSTRING(@OrderExpression,1,5)) <> 'Where'
BEGIN
SET @OrderExpression = 'ORDER BY ' + @OrderExpression
END
END
PRINT @OrderExpression
IF @PageIndex IS NULL or @PageIndex < 1
BEGIN
SET @PageIndex = 1
END
PRINT @PageIndex
IF @PageSize IS NULL or @PageSize < 1
BEGIN
SET @PageSize = 10
END
PRINT @PageSize
DECLARE @SqlQuery VARCHAR(4000)
SET @SqlQuery='Select '+@SelectList+',RowNumber
FROM
(Select ' + @SelectList + ',ROW_NUMBER() OVER( '+ @OrderExpression +') AS RowNumber
FROM '+@TableSource+' '+ @SearchCondition +') AS RowNumberTableSource
Where RowNumber BETWEEN ' + CAST(((@PageIndex - 1)* @PageSize+1) AS VARCHAR)
+ ' AND ' +
CAST((@PageIndex * @PageSize) AS VARCHAR)
-- orDER BY ' + @OrderExpression
PRINT @SqlQuery
SET NOCOUNT ON
EXECUTE(@SqlQuery)
SET NOCOUNT OFF
RETURN @@RowCount
END
G
[解决办法]
--由于SELECT比DISTINCT先执行。所以你可以再套一层，先DISTINCT完后，再用ROW_NUMBER(),参考：http://blog.csdn.net/wwwwgou/article/details/6316796
--你的代码可以修改如下：
CREATE PROCEDURE [dbo].[GetRecordFromPage]
@SelectList VARCHAR(2000), --欲选择字段列表
@TableSource VARCHAR(100), --表名或视图表
@SearchCondition VARCHAR(2000), --查询条件
@OrderExpression VARCHAR(1000), --排序表达式
@PageIndex INT = 1, --页号,从0开始
@PageSize INT = 10 --页尺寸
AS
BEGIN
IF @SelectList IS NULL or LTRIM(RTRIM(@SelectList)) = ''
BEGIN
SET @SelectList = '*'
END
PRINT @SelectList
SET @SearchCondition = ISNULL(@SearchCondition,'')
SET @SearchCondition = LTRIM(RTRIM(@SearchCondition))
IF @SearchCondition <> ''
BEGIN
IF UPPER(SUBSTRING(@SearchCondition,1,5)) <> 'Where'
BEGIN
SET @SearchCondition = 'Where ' + @SearchCondition
END
END
PRINT @SearchCondition
SET @OrderExpression = ISNULL(@OrderExpression,'')
SET @OrderExpression = LTRIM(RTRIM(@OrderExpression))
IF @OrderExpression <> ''
BEGIN
IF UPPER(SUBSTRING(@OrderExpression,1,5)) <> 'Where'
BEGIN
SET @OrderExpression = 'ORDER BY ' + @OrderExpression
END
END
PRINT @OrderExpression
IF @PageIndex IS NULL or @PageIndex < 1
BEGIN
SET @PageIndex = 1
END
PRINT @PageIndex
IF @PageSize IS NULL or @PageSize < 1
BEGIN
SET @PageSize = 10
END
PRINT @PageSize
DECLARE @SqlQuery VARCHAR(4000)
SET @SqlQuery='Select '+@SelectList+',RowNumber from (' +
'Select '+@SelectList+',ROW_NUMBER() OVER( '+ @OrderExpression +') AS RowNumber
FROM (Select DISTINCT ' + @SelectList +
' FROM '+@TableSource+' '+ @SearchCondition +') AS RowNumberTableSource ) as T
Where RowNumber BETWEEN ' + CAST(((@PageIndex - 1)* @PageSize+1) AS VARCHAR)
+ ' AND ' + CAST((@PageIndex * @PageSize) AS VARCHAR)
-- orDER BY ' + @OrderExpression
PRINT @SqlQuery
SET NOCOUNT ON
EXECUTE(@SqlQuery)
SET NOCOUNT OFF
RETURN @@RowCount
END
GO
--测试:
EXEC [GetRecordFromPage] 'number', 'master..spt_values', 'number=1', 'number desc', 1, 10
go
/*
numberRowNumber
11
*/
